(Cover) - EN Star Style - Katie Holmes loved the simplicity of her Jacqueline Kennedy Onassis costumes, according to her costume designer.

The 32-year-old actress is starring as the late first lady in upcoming series The Kennedys which debuts on Americas Reelz Channel on April 3.

Katies wardrobe designer Chris Hargadon has revealed the actress was very appreciative of Jacquelines iconic style during filming.

She was always representative with the things we presented because she loved Jackie's style in clothes, the simplicity of the lines, the fabric and workmanship. She came with a lot of research under her belt and she had certain likes, he said in an interview posted by Reelz Channel.

The Hollywood star is set to wear some of Jacquelines most legendary outfits during the series, which features Greg Kinnear in the John F. Kennedy role, including the pink day suit and pillbox hat she was wearing on the day her husband was assassinated in November 1963.

Costume expert Chris says he relied on extensive research in order to create sound replicas. He also revealed that he shopped online through vintage dealers for fabrics that helped him achieve authentic looks for Katie.

Chris says he paid particular attention to Katies replicated mourning suit, which was worn by Jacqueline on the day of her husbands funeral.

"The original suit was a Cassini and had interesting tassel buttons....Jackie wore the suit quite a bit in the days of her mourning because she didn't have a lot of black clothing, he explained. (C) Cover Media